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    <script>
        var mymap = L.map('map').setView([110, 34], 4);

        L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
            maxZoom: 18
        }).addTo(mymap);
        var nexrad = L.tileLayer.wms("https://emergency.fubangnet.cn/geodata/arcgis/rest/services/CP0502010200_zjj/MapServer/export", {
            layers: 'show:52',
            format: 'PNG32',
            transparent: true,
            attribution: "Weather data © 2012 IEM Nexrad"
        }).addTo(mymap);
        nexrad.setParams({
            id: 380,
            pid: 730,
            tk: "ad015ee6-f4cc-4ea9-a007-1ccb200fa4c0",
            F: 'image',
            TRANSPARENT: 'true',
            SIZE: '512,512',
            BBOXSR: '3857',
            IMAGESR: '3857'
        })
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